Hand-operated diestock



Aug, 21, 192s.

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HENRI BERN'AUinIN', oF oosNE-sUR-Lornn, FRANCE.'

HANDQOPERATED mns'rocx.'

A'ppnatieir fired July 12, 1926, serial No. 121,960, andv in irrancemiigust 7, 1925.

This inventionrelates to hand operated diestocks of the type comprising a carrier or frame for the die or die vparts,providedwith two "operating handles and havi'ngme'ans for centering the rod or the 4like to be screw threaded, such means consisting' ot' two mov-` able guidef'members with recessedv ends "adapted to engage the said rod or the like, the said inembersbeing suitably attachedtothe carrier or frame.

According to the present invention the two loperating" handles' ofthe die-stock areeach pivoted tothe ,carrier f or frame rand soV interconnec'ted'that when one is-moved about its pivot the other is moved about its ypivot through a similarangle but in the opposite di rection. The centering members are' attached to and move `with these handles and the arrangement'i's sucli'that when the'handles' of the die-stock aiejoperatedto cut the screw thread, the recessed endsV of the centering members areV forced against the rod or the like. n v The'die'islpreferablymade from a number of parts and 2Vadjust'ablewedgelmeans,are pro-` vided for adjusting and'centeringthe parts otth'el'dio Ain a' mannergenera-lly known in die-stocks of the type to which the invention relates.

The annexed drawings show, by way of example, one constructional embodiment of the invention, in which Fig. 1 is a. front elevational view of the tool' Fig. 2 is a view looking from beneath in Fig. 1;`

Fig. 3 shows la section of the device'iir tended to control the play ot' the parts of the die;

Fig. 4 is a plan view illustrating the play of these parts; and i Fig. 5 is a sectional elevation on the line A-B Fig. L1. i Y f The die-stock consists of a central portion 1 provided at each side withlugs 2, between whichare openings 3 adapted for the attachment of arms or handles 11.

These arms 4 are extended into and pivotally mounted in position by bearing portions 5, which are pivoted between the lugs 2 and each of them is provided at the side with a lever G which levers are hinged together at 7 and embrace the central Vor middle portion 1. The two arms t are therefore dependent upon one another, and small angular movements imparted to one of the arms moves the second arm through a like angle,the levers 6 beine' formed springy and moving towards and from-the centre oit the die-stock to permit the movement. Furthermore a stop pin or Vprojection 8 limits the downward movement of the levers Gand the upward movement is liniited asherea'fter explained.

Each of the arms operates or controls a guid'epiece Q'iXed to the bearing portion 5 thereof' by means of a screw 10, the extremity 110i theguide piece being oi' double bevel forma' The extremities ot these two guide pieces 9 are adyusted very accurately and at an absolutely' exact distance `trom the centre ot the parts l2 of the die so'as to be able to simultaneously be forcedagainstthe rod to be screw threaded, from diametrically opposite sides'in order to centre it with respyect'to the axis olf tliestock duri'ngthe whole` time that the work is beingconducted.` `The.upward movement ot the levers G is limitedby the extremities 1101:

the pieces' 9 coming into VContact with therod or the like.

' The central or middle portion liis provided withv a perforation liurn'islied with a ledge 14". adapted to receive the die portions 191,1

which are threein numlier.^ These portions. as shown in Figsfi and 5, are provided around their periphery with a groovel in which is located a helical spring which keeps them coupled together. The helical spring is not shown on the drawings but is provided with a loop or other portion through which the pointed rod of a regulating device hereafter described, is adapted toproject. Two of the die portions 12 are vprovided vwith a channel constituting when they are assembled 'togetherA a slightly conical perforation 1G in which en gages the pointed rod of the regulating device.

shown at Fig. S. rl`his device includes the pointed rod 17 furnished with a milled head and adapted to screw into the clamp orholder 18 located in a recess provided in the central or middleportion 1 oi? the stock. This cla1np ing piece y18 is provided with an incurved portion adapted to lit exactly against the die portions 12'. 12) is a locknut screwing into a. screw threaded perforation in the middle portion 1 and enabling the device to be locked after regulating the space between the three die portions 12 according to requirements.

After these die portions 12 have been placed in their holder 13, the pointed rod 17-is screwed in until its extremity penetrates into the slightly conical hole 16. In `this way the diameter of the screw thread can be varied by separating more or less two of the parts 12,

which parts are restored to position by the helical spring located in the channel 1.5 when it is desired to obtain a thread of the smallestI possible diameter.

rlhe parts 12 being` placed in their holder or casing, the pointed rod 17 enables these latter to be vseparated and the clamping piece 18 controlled by the lockingl screw 19 enables the three parts to be brought together to di- `ninish thc diameter ot the screw threaded ele` ment. Y

The die itself may consist of any suitable number of blocks orparts 12 (three in the case shown). The coupling together of these parts is elected by engaging parts 2O.v

The action ofthe device is as follows'. The rod to be screw threaded is held in a vise or the like in the ordinary manner and the die is placed on the end thereof. At the commencement of the operations the handles 4: are pulled upwards to move about their pivots 5 as far as permitted by the stop 8. This causes the extremities 11 of the guide pieces 9 to separate as tar as possible and remain free of the rod to be screw threaded which is located between them. Now by pressing downwards on the handles 4;, they turn to a slight extent on their vpivots 5y and the extremities 11 of the guide pieces 9 are caused n to bear against the rod to be screw threaded.

It will thus be seen that this rod bythe extremities 11 supports the tool evenly with' lrelation to the rod and provides a steady self-centering device enablingthehdie p0rtions lto cut an accurate thread.

What claim and desire to secure lbv Let-y ters Patent of the United States of America kf in combination a carrier for the die, a die supported by said carrier, two handles pivoted to the carrier at diametrically opposite positions with respect to the die, the axes o the vpivots being disposed at right angles to the axis of the die, yinterconnecting means between the pivoted handles JforV ensuring equal angular movement lof the handles in opposite directions, and guide members attached to the handles, the extremities Of'said `guidemembers being disposed opposite each other and at equal distances from the axis of the die.

v 2. A hand operated die-stock comprising in combination a carrier -for the die, a circular stepped openingin the carrier, a die formed from aplurality of sections located in said stepped opening, means vsupported kby the carrier for radjusting` the sections of the die, two handles pivoted to the carrier at diametrically opposite positions .with respect to the die, the axes of the pivots being disposed at right angles to theaxis of the die, interconnecting i means between the pivoted handles for ensuring equal angular movement ot' the handles in opposite directions, yand `guide members attached tothe handles, the

extremities of said guide members being disposed Aopposite to each other andk at' equal distances tromthe axis of the die.

In witness whereof I aliix inyl signature.`

HENRI BERN AUBIN.v 

